6820 / 6820EVS Manual P/N LS10144-001SK-E:C 09/28/2017 147
10.7.1 Single Interlock Zone Releasing
A single interlock zone utilizes a minimum of two addressable detectors and a designated manual release switch.
Conditions Required for an Pre-Alarm Output Activation
If any single addressable detector is activated, the “Pre-Alarm” output will activate. This alerts the user that the initial stages required for
a release condition are present. (Also refer to Table 10.4.)
Conditions required for an General Alarm and Release Output Activation
If two or more addressable detectors, or a manual release switch activate, the “Alarm” and the “Release” outputs will activate and the
“Pre-Alarm” output will deactivate. (Also refer to Table 10.4.)
10.7.2 Double Interlock Zone Releasing
A Double Interlock Zone uses a minimum of two addressable detectors, a designated manual release switch, and an interlock switch
input. An interlock switch is typically a dry-contact pressure switch and will be referred to as an interlock/pressure switch in this docu-
ment.
Conditions Required for a Pre-Alarm Output Activation
If any single addressable detector is activated, the “Pre-Alarm” output will activate. This alerts the user that the initial stages required for
a release condition are present. (Also refer to Table 10.4.)
Conditions Required for a General Alarm Output Activation
If two addressable detectors, a manual release switch is activated, or an interlock switch is active, the “Pre-Alarm”, and “General Alarm”
outputs will activate.
Important!
Only addressable detectors can be used. No conventional detectors can be used.
Each Single Interlock Zone input requires at least one manual release switch.
Inputs Output Results
1st Addressable Detector
x x x x
2nd Addressable Detector
x x x x
Manual Release Station
x x x x
Normal
Pre-Alarm
Pre-Alarm
Release and General Alarm
Release and General Alarm
Release and General Alarm
Release and General Alarm
Release and General Alarm
Table 10.4 : Single Interlock Zone Operation
Important!
Only addressable detectors can be used. No conventional detectors can be used.
Each Double Interlock Zone input requires at least one Interlock/pressure switch and at least one manual release switch.
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